Want or absence of something necessary for completeness or perfection; deficiency; -- opposed to superfluity.
- The lack of something necessary or desirable for completion or perfection; a deficiency: a visual defect.
- An imperfection that causes inadequacy or failure; a shortcoming. See Synonyms at blemish.
- To disown allegiance to one's country and take up residence in another: a Soviet citizen who defected to Israel.
- To abandon a position or association, often to join an opposing group: defected from the party over the issue of free trade.